You sound like my oldest son -- he can be extremely quiet, but if it clicks and/or once he's comfortable, he can talk a blue streak. During his senior year of high school, he was voted "The Most Non Talkative Person You Will Ever Have a Long Conversation With."
Those are some great tips from KDCat to build your conversation skills, relate info about yourself and keep conversation from falling into that dreaded pit of awkward silence. They really can serve you well during recruitment!
A VERY simple trick to standing out is one I learned from Dale Carnegie's "How to Win Friends and Influence People." He says there is nothing more musical to people than the sound of their own name. So, when Sarah Sister introduces herself, instead of just saying "hi," say "Hi Sarah." When you're getting ready to part ways, say "it was nice to meet you, Sarah" instead of leaving her name off. Names validate people, and book ending your conversation with someone's name is just one of those little pieces of conversation gold that can click with a person. Test it out on people and see if you don't note a difference in their demeanor. I have friends who swear they've gotten better customer service doing this. I have also observed that people who do this on a regular basis seem to have more people interested in being around them. So often, it is the little things that make you or break you.
Another old trick -- if conversation with a woman really is dying and all else fails, comment on her hair. "By the way, your hairstyle is so cute." Laugh, but I swear the topic of a woman's hair will revive any conversation with her.